Chuck.



No. 821,687. PATENTBD MAY 29, 190e. P. A. WHITNEY L R. G. BLLRIGH.

CHUCK.

APPLICATION FILED 00T.2z,1904.

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PATENT crimen.

PARDON A. WHITNEY AND ROBERT C. ELLRICH, OF SOUTHINGTON, CON- NECTICUT, ASSIGNOR TO PECK, STOW 8a VVILCOX COMPANY, OF SOUTH- INGTON, CONNECTICUT, A CORPORATION OF CONNECTICUT.

CHUCK.

rfatenteol May 29, 1906.

Application filed October 22, 1904. Serial No. 229.581.

`T a/Z/ whom, it may concern.:

Be it known that we, PARDON A. WHITNEY and ROBERT C. ELLRIGH, citizens of the United States of America, residing at Southington, in the county of Hartford and State of Connecticut, have invented certain new and useful Tmprovements in Chucks, of which the following is a specification.

The invention herein described relates to 1o general chuck construction, and is particularly adapted for use on braces or bitstocks, as they are sometimes called.

The object of the invention is to produce a device of the class specified having features I 5 of novelty.

Our invention is illustrated in the accompanying drawings, in which-- Figure l is a side elevation of an embodiment of our invention with certain parts 2o shown in central vertical section. Fig. 2 is a view of the spindle, the jaws, and a spreading device, being a section on the line :1; :c of Fig. 1. Fig. 3 shows a detail perspective view of the locking device with the parts constitut- 2 5 ing the device separated for the purpose of clearer illustration. Fig. l is an end view of the chuck-body.

Referring to the drawings, c is the spindle, slotted, as at a, to receive the jaws and 3o having a quick thread (1,2 cut on the exterior surface of its slotted end, the pitch of the thread being about one to an inch. A sleeve c fits over the spindle and is interiorly threaded to fit the thread on the spindle. At 3 5 one end the sleeve has an enlargement c', provided on its exterior with a lfine thread c2, preferably about twenty pitch. A cap d is interiorly threaded to fit the thread c2 on the sleeve enlargement c and carries the jaw- 4o closing cone e, which is provided with suitable slots for the jaws, as is customary. Ballbearings e are provided between the contacting surfaces of the cone and cap to permit free movement of the cap about the cone when the jaws are being tightened on a tooly shank. The cone is held in place in the cap by a split ring e2, which 'lits in a groove in the cap back of the cone.

The spindle is shouldered, as at a3, and the 5o sleeve c carries a stop-screw c3, which prevents the accidental displacement of the sleeve. On the enlarged end of the sleeve back of the thread are two pins c4 csfwhich,

l in connection with the stop-screw d', limit the 1 forward and backward movement of the cap.

In the bottom of the slot c is located. a gripping member f, made up, preferably, in three parts, which are united by a spring 3, the central member f being recessed, as at f2, to receive the end of the jaws. The action of the cone e on the jaws when they are being closed is to seat them in the slotted spindle by a slightly rearward movement which expands the gripping member f, throwing its end pieces f 4 out into contact with the sleeve and locking it to the spindle.

The operation of the device is as follows: If the jaws are in wide-open position and a tool inserted, one turn of the sleeve will close the jaws on the tool owing to the quick thread, which advances the sleeve and closes the jaws rapidly. This quick thread, however, does not have sufficient leverage to give as hard a pinch of the jaws on the tool as is necessary, so by turning the cap d on its whole thread about the sleeve the jaws are closed firmly onto the tool. If the gripping device for the sleeve c were omitted, the rotation of the cap would not cause it to run back on the sleeve, because the crowding of the cone onto the jaws creates a greater resistance than the coarse pitched threads offer to the sleeve, and consequently the'tendency would be to draw the sleeve c off' the spindle. To loosen the jaws, the cap is turned back until the stop-screw d strikes the pin c5, causing the sleeve to move back on the spindle, the spring f3 drawing the gripping members in as soon as the pressure of the jaws is released.

The advantages of this construction are obvious. The jaws are quickly closed and opened, the tool is held firmly, and the construction and operation of the device are eX- tremely simple.

We claim as our invention- 1. In a chuck a spindle, jaws carried thereby, and means for closing said jaws comprising a quick-acting sleeve mounted on said spindle and adapted to cause the initial closing of said jaws, automatic means for locking said quick-acting sleeve to the spindle after it has operated, and a slow-acting sleeve mounted on said quick-acting sleeve and adapted for operation after said quick-acting sleeve is locked, substantially as described.

IOO

2. In a chuck the combination with the spindle and the aws carried thereby, of means for closing said jaws, said means comprising a quick-acting sleeve mounted on the spindle and adapted to effect the initial closing of the jaws, automatic means for locking said sleeve to the spindle after it has operated, and a slow-acting sleeve mounted on said quick-acting sleeve and adapted to finally close said jaws, said slow-acting sleeve adapted for rotary and lengthwise movement relative to the quick-acting sleeve after the latter is locked.

`3. In a chuck the combination with the slotted spindle and the jaws located in the slot in the spindle, of means for closing said jaws comprising a quick-acting sleeve mounted on the spindle adapted to effect the imtial closing of the jaws, an expansible gripping device located in the slot in the spindle behind the jaws and adapted to be expanded by the rearward movement of the jaws under the influence of said quick-acting sleeve to lock said sleeve to the spindle, and a slowacting sleeve mounted on said quick-acting sleeve and operative, after the last-mentioned sleeve is locked, to effect the iinal closing of the aws.

4. In a chuck the combination with the slotted spindle and expansible gripping device located in said slot, and the jaws located in said slot with their rear ends resting on said gripping device, of a quick-acting sleeve mounted on the spindle and adapted to effect the initial closing of the jaws and the spreadsance? ing of the gripping device to lock said sleeve to the spindle, and a slow-acting sleeve mounted on said quick-acting sleeve and adapted to effect the final closing of the aws after'tlie quick-acting sleeve is locked, a conical end member carried by said slow-acting sleeve, and antifriction devices for said end member.

5. In a chuck a spindle, jaws carried thereby, and means for closing said jaws comprising a quick-acting sleeve mounted on said spindle and adapted to cause the initial closing of said jaws, means for locking said quickacting sleeve to the spindle after it has operated, and a slow-acting sleeve mounted on said quick-acting sleeve and adapted for operation after said quick-acting sleeve is locked, substantially as described.

6. In a chuck a spindle, jaws carried thereby, and means for closing said aws comprising a quick-acting sleeve mounted on said spindle and adapted to cause the initial closing of said aws, means for holding said sleeve against movement after the initial closing is effected, and a slow-acting sleeve operative independently of and after said quick-acting sleeve has ceased to act for effecting the iinal closing of said jaws.

In testimony whereof we affix our signatures in presence of two witnesses.

PARDON A. WHITNEY. ROBERT C. ELLRICH. Witnesses:

JEREMIAH A. KENYON, THOMAS F. WELCH. 

